Fix :mc/REGEXP not placing real cursor in correct position

With ':mc/abc' we should get

  a b c
  a b [a]bc
  a [a]bc c
  [a]bc b c
  a b c

Instead, we got

  a b c
  a b abc
  a [a]bc c
  [a]bc b c
  a b c

And the real cursor would be somewhere else (on the same column it was
left in when you were in visual mode).

modules/editor/multiple-cursors/autoload/evil-mc.el

@@ -56,6 +56,7 @@ PATTERN as literal. PATTERN is a delimited regexp (the same that :g or :s uses).
 FLAGS can be g and/or i; which mean the same thing they do in
 `evil-ex-substitute'."
   :evil-mc t
+  :keep-visual t
   (interactive "<R><//!><!>")
   (unless (and (stringp pattern)
                (not (string-empty-p pattern)))